This is a sequential discovery puzzle by William Strijbos.  The first step to opening this puzzle is defeat the standard 4-number lock on the outside.  Here is what is included with your purchase:PuzzlePrintout of original email instructions from StrijbosOriginal box used to contain puzzle (it's originally for something else, but Strijbos used it to ship the puzzle)Original damaged sheet metal number plateStep by step solution written by meRepairs: there is a small metal plate that with the t...

Keep Locked is Robert Yarger's newest sequential discovery puzzle.  Great condition.  Solved once.One small internal component was re-glued by Robert Yarger.

i'm not sure where Jesse gets the concepts for his puzzles, but they often remind me of movies. this one reminds me of Pirates Of The Caribbean. (the first one (i mean the good one).) but if i'd been born half a century earlier it would probably remind me of Treasure Island. not due to any direct resemblance or reference, but due to the concept and intriguing solution path. on that note, when you have solved this puzzle, you may not have solved this puzzle. ♫:Â...